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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2009 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: LZMADecompressor.html 16 2014-02-13 19:56:57Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.lzma.client;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.gwt.core.client.Scheduler;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.io.IOException;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.io.InputStream;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.io.OutputStream;<a name="line.14"></a>
<span class="sourceLineNo">015</span><a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.dellroad.lzma.client.SevenZip.Compression.LZMA.Chunker;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import org.dellroad.lzma.client.SevenZip.Compression.LZMA.Decoder;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>/**<a name="line.19"></a>
<span class="sourceLineNo">020</span> * LZMA decompressor.<a name="line.20"></a>
<span class="sourceLineNo">021</span> */<a name="line.21"></a>
<span class="sourceLineNo">022</span>public class LZMADecompressor implements Scheduler.RepeatingCommand {<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>    private Chunker chunker;<a name="line.24"></a>
<span class="sourceLineNo">025</span>    private long length;<a name="line.25"></a>
<span class="sourceLineNo">026</span>    private IOException exception;<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>    /**<a name="line.28"></a>
<span class="sourceLineNo">029</span>     * Constructor.<a name="line.29"></a>
<span class="sourceLineNo">030</span>     *<a name="line.30"></a>
<span class="sourceLineNo">031</span>     * &lt;p&gt;<a name="line.31"></a>
<span class="sourceLineNo">032</span>     * Decompression will stop when one of the following is true:<a name="line.32"></a>
<span class="sourceLineNo">033</span>     * &lt;ul&gt;<a name="line.33"></a>
<span class="sourceLineNo">034</span>     * &lt;li&gt;An "end of file" marker is read from the compressed data&lt;/li&gt;<a name="line.34"></a>
<span class="sourceLineNo">035</span>     * &lt;li&gt;The decompressed output reaches the length encoded in the compressed data&lt;/li&gt;<a name="line.35"></a>
<span class="sourceLineNo">036</span>     * &lt;li&gt;The end of {@code input} is reached&lt;/li&gt;<a name="line.36"></a>
<span class="sourceLineNo">037</span>     * &lt;/ul&gt;<a name="line.37"></a>
<span class="sourceLineNo">038</span>     *<a name="line.38"></a>
<span class="sourceLineNo">039</span>     * &lt;p&gt;<a name="line.39"></a>
<span class="sourceLineNo">040</span>     * The input and output streams will &lt;em&gt;not&lt;/em&gt; be closed when the operation completes.<a name="line.40"></a>
<span class="sourceLineNo">041</span>     *<a name="line.41"></a>
<span class="sourceLineNo">042</span>     * @param input compressed input<a name="line.42"></a>
<span class="sourceLineNo">043</span>     * @param output uncompressed output<a name="line.43"></a>
<span class="sourceLineNo">044</span>     * @throws IOException if {@code input} or {@code output} causes an exception<a name="line.44"></a>
<span class="sourceLineNo">045</span>     * @throws IOException if the compressed data is truncated or corrupted<a name="line.45"></a>
<span class="sourceLineNo">046</span>     */<a name="line.46"></a>
<span class="sourceLineNo">047</span>    public LZMADecompressor(InputStream input, OutputStream output) throws IOException {<a name="line.47"></a>
<span class="sourceLineNo">048</span>        init(input, output);<a name="line.48"></a>
<span class="sourceLineNo">049</span>    }<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span>    LZMADecompressor() {<a name="line.51"></a>
<span class="sourceLineNo">052</span>    }<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span>    void init(InputStream input, OutputStream output) throws IOException {<a name="line.54"></a>
<span class="sourceLineNo">055</span>        byte[] properties = new byte[5];<a name="line.55"></a>
<span class="sourceLineNo">056</span>        for (int i = 0; i &lt; properties.length; i++) {<a name="line.56"></a>
<span class="sourceLineNo">057</span>            int r = input.read();<a name="line.57"></a>
<span class="sourceLineNo">058</span>            if (r == -1)<a name="line.58"></a>
<span class="sourceLineNo">059</span>                throw new IOException("truncated input");<a name="line.59"></a>
<span class="sourceLineNo">060</span>            properties[i] = (byte)r;<a name="line.60"></a>
<span class="sourceLineNo">061</span>        }<a name="line.61"></a>
<span class="sourceLineNo">062</span>        Decoder decoder = new Decoder();<a name="line.62"></a>
<span class="sourceLineNo">063</span>        if (!decoder.SetDecoderProperties(properties))<a name="line.63"></a>
<span class="sourceLineNo">064</span>            throw new IOException("corrupted input");<a name="line.64"></a>
<span class="sourceLineNo">065</span>        long expectedLength = -1;<a name="line.65"></a>
<span class="sourceLineNo">066</span>        for (int i = 0; i &lt; 64; i += 8) {<a name="line.66"></a>
<span class="sourceLineNo">067</span>            int r = input.read();<a name="line.67"></a>
<span class="sourceLineNo">068</span>            if (r == -1)<a name="line.68"></a>
<span class="sourceLineNo">069</span>                throw new IOException("truncated input");<a name="line.69"></a>
<span class="sourceLineNo">070</span>            expectedLength |= ((long)r) &lt;&lt; i;<a name="line.70"></a>
<span class="sourceLineNo">071</span>        }<a name="line.71"></a>
<span class="sourceLineNo">072</span>        this.length = expectedLength;<a name="line.72"></a>
<span class="sourceLineNo">073</span>        this.chunker = decoder.CodeInChunks(input, output, this.length);<a name="line.73"></a>
<span class="sourceLineNo">074</span>    }<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span>    /**<a name="line.76"></a>
<span class="sourceLineNo">077</span>     * Process the next chunk of data. If an {@link IOException} is thrown during processing,<a name="line.77"></a>
<span class="sourceLineNo">078</span>     * this returns {@code false} and {@link #getException} will return the caught exception.<a name="line.78"></a>
<span class="sourceLineNo">079</span>     *<a name="line.79"></a>
<span class="sourceLineNo">080</span>     * @return {@code true} if there is more work to do, otherwise {@code false}<a name="line.80"></a>
<span class="sourceLineNo">081</span>     * @throws IllegalStateException if this compression operation has already completed<a name="line.81"></a>
<span class="sourceLineNo">082</span>     */<a name="line.82"></a>
<span class="sourceLineNo">083</span>    @Override<a name="line.83"></a>
<span class="sourceLineNo">084</span>    public boolean execute() {<a name="line.84"></a>
<span class="sourceLineNo">085</span>        try {<a name="line.85"></a>
<span class="sourceLineNo">086</span>            return this.chunker.processChunk();<a name="line.86"></a>
<span class="sourceLineNo">087</span>        } catch (IOException e) {<a name="line.87"></a>
<span class="sourceLineNo">088</span>            this.exception = e;<a name="line.88"></a>
<span class="sourceLineNo">089</span>            return false;<a name="line.89"></a>
<span class="sourceLineNo">090</span>        }<a name="line.90"></a>
<span class="sourceLineNo">091</span>    }<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span>    /**<a name="line.93"></a>
<span class="sourceLineNo">094</span>     * Determine how much of the output data has been generated so far.<a name="line.94"></a>
<span class="sourceLineNo">095</span>     * If a length of {@code -1} was encoded in the compressed data, then this always returns zero.<a name="line.95"></a>
<span class="sourceLineNo">096</span>     *<a name="line.96"></a>
<span class="sourceLineNo">097</span>     * @return a value from 0.0 to 1.0<a name="line.97"></a>
<span class="sourceLineNo">098</span>     */<a name="line.98"></a>
<span class="sourceLineNo">099</span>    public double getProgress() {<a name="line.99"></a>
<span class="sourceLineNo">100</span>        if (this.length == -1)<a name="line.100"></a>
<span class="sourceLineNo">101</span>            return 0.0;<a name="line.101"></a>
<span class="sourceLineNo">102</span>        return (double)this.chunker.getOutBytesProcessed() / (double)this.length;<a name="line.102"></a>
<span class="sourceLineNo">103</span>    }<a name="line.103"></a>
<span class="sourceLineNo">104</span><a name="line.104"></a>
<span class="sourceLineNo">105</span>    /**<a name="line.105"></a>
<span class="sourceLineNo">106</span>     * Get the exception thrown during the previous execution round, if any.<a name="line.106"></a>
<span class="sourceLineNo">107</span>     * &lt;b&gt;Note:&lt;/b&gt; this method must be checked after compression is complete to determine<a name="line.107"></a>
<span class="sourceLineNo">108</span>     * if there was an error.<a name="line.108"></a>
<span class="sourceLineNo">109</span>     *<a name="line.109"></a>
<span class="sourceLineNo">110</span>     * @return thrown exception, or {@code null} if none was ever thrown<a name="line.110"></a>
<span class="sourceLineNo">111</span>     */<a name="line.111"></a>
<span class="sourceLineNo">112</span>    public IOException getException() {<a name="line.112"></a>
<span class="sourceLineNo">113</span>        return this.exception;<a name="line.113"></a>
<span class="sourceLineNo">114</span>    }<a name="line.114"></a>
<span class="sourceLineNo">115</span>}<a name="line.115"></a>
<span class="sourceLineNo">116</span><a name="line.116"></a>




























































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